“Then you know how complicated it would be. People along the land route, like the Celts and the Etruscans, had to cooperate on trade agreements in order to move the materials along. I think trade was a lot more extensive than my colleagues would admit. All this has fascinating implications about how we view ancient civilizations. They weren't all about war; they knew the value of peaceful alliances a long time before the EU or NAFTA. And I mean to prove it.”

“Ancient globalization? An ambitious goal. I wish you luck.”

“I'll need it. But if I do succeed I'll have you and NUMA to thank. Your agency has been wonderfully generous in the use of its research vessel and equipment.”

“It goes both ways. Your project gives NUMA a chance to test our new vessel in inland waters and to see how this submersible operates under field conditions.”

She made a sweeping gesture with her hand. “The scenery is perfectly lovely. All we need is a bottle of champagne and foie gras.” Austin leaned over and handed a small plastic cooler to his companion “Can't help you there, but how about ajambon et frontage sandwich?”

“Ham and cheese would be my second choice.” She unzipped the cooler, extracted a sandwich, handed it to Austin and took one for herself.

Austin brought the submersible to a hovering stop. As he chewed on his lunch, savoring the crusty baguette and the creamy slab of Camembert cheese, he studied a chart of the lake.

“We're here, alongside a natural shelf that roughly parallels the shoreline,” he said, running his finger along a wavy line. “This could have been exposed land centuries ago.”

“It goes along with my findings. A section of the Amber Route skirted the shore of Lac du Dormeur. When the waters rose, the traders found another route. Anything we find here would be very old.” , “What exactly are we looking for?”

“I'll know it when I see it.”

“Good enough for me.”

“You're far too trusting. I'll elaborate. The caravans that plied the Amber Route needed places to stop for the night. I'm looking for the ruins of hospices, or settlements that may have grown up around a stopping place. Then I hope to find weapons that would flesh out the full trade story.”

They washed their lunch down with Evian water, and Austin's fingers played over the controls. The battery-powered electrical motors hummed, activating the twin lateral thrusters that the sphere rested on, and the submersible continued its exploration.

The SEAmagine SEA mobile was fifteen feet long, about the length of a mid sized Boston whaler, and only seven feet wide, but it was capable of carrying two people in one-atmosphere comfort to a depth of fifteen hundred feet for hours at a time. The vehicle had a range of twelve nautical miles and a maximum speed of 2.5 knots. Unlike most submersibles, which bobbed like a cork when they surfaced, the SEA mobile could be operated like a boat. It sat high in the water when it wasn't submerged, giving the pilot clear visibility, and could cruise to a dive site or edge up to a dive platform.